Revert of check for inputs before reporting asColorFilter

Revert of check for inputs before reporting asColorFilter (patchset #7 id:110001 of https://codereview.chromium.org/967833003/)

Reason for revert:
Need to suppress these for rebaselining, so reverting for now.

Regressions: Unexpected image-only failures (5)
  css3/filters/effect-brightness-clamping-hw.html [ ImageOnlyFailure ]
  css3/filters/effect-combined-hw.html [ ImageOnlyFailure ]
  virtual/slimmingpaint/css3/filters/effect-brightness-clamping-hw.html [ ImageOnlyFailure ]
  virtual/slimmingpaint/css3/filters/effect-combined-hw.html [ ImageOnlyFailure ]

Upon coarse visual inspection of the diffs, it appears the differences are tiny. I think this is due to ComposeColorFilter now combinging heterogeneous filters and collapsing that part of the dag (i.e. a possible perf improvement).


Original issue's description:
> Use ComposeColorFilter in factory to collapse consecutive filters (when possible).
> Change asColorFilter to reflect its reliance on the new factory behavior.
> 
> patch from issue 967143002 at patchset 80001 (http://crrev.com/967143002#ps80001)
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/dac843bf046c2cd79fd955cb177aee241d7a4b0c

TBR=senorblanco@chromium.org,robertphillips@google.com,bsalomon@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/5c518a862264225f0a378e4728e037966ddf4cc2

[reed1, 2015-03-05 22:47:20]

Created Revert of check for inputs before reporting asColorFilter

[commit-bot: I haz the power, 2015-03-05 22:47:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/978923005/1

[commit-bot: I haz the power, 2015-03-05 22:47:33]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/5c518a862264225f0a378e4728e037966ddf4cc2